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Reports incorrect registration of plugin components (Actions and Components).
<p>
  The following problems are reported:
</p>
<ul>
  <li>Action/Component implementation class is abstract.</li>
  <li>Class is registered in plugin.xml as action but does not extend <code>AnAction</code> class.</li>
  <li>Action class does not have a public no-argument constructor.
  </li>
</ul>
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